fix(net):fix block fetching issue in FetchBlockService

[jwrct]

What does this PR do?
Fix the issue of repeated block fetching in FetchBlockService.

Why are these changes required?

This PR has been tested by:

• Unit Tests
• Manual Testing

Follow up

Extra details

[codecov-commenter]

Codecov Report

Merging #5094 (74c8179) into release_v4.7.2 (6db2db9) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

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@@                 Coverage Diff                  @@
##             release_v4.7.2    #5094      +/-   ##
====================================================
- Coverage             54.72%   54.72%   -0.01%     
- Complexity             8238     8240       +2     
====================================================
  Files                   841      841              
  Lines                 49715    49719       +4     
  Branches               5460     5461       +1     
====================================================
+ Hits                  27205    27207       +2     
- Misses                20370    20373       +3     
+ Partials               2140     2139       -1     

Impacted Files	Coverage Δ
...in/java/org/tron/core/net/peer/PeerConnection.java	33.33% <0.00%> (-1.00%)	⬇️
...java/org/tron/core/net/service/adv/AdvService.java	40.77% <0.00%> (ø)
...core/net/service/fetchblock/FetchBlockService.java	20.23% <0.00%> (ø)

... and 1 file with indirect coverage changes

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